AIPMT PRELIMS 2010 Physics Stopping Potential MCQ Question
The potential difference necessary to stop the fastest photo electrons emitted by a nickel surface, having work function 5.01 eV, when ultraviolet light of 200 nₘ falls on it, must be
1.2 V
2.4 V
−1.2 V
−2.4 V
Correct Answer
Detailed Explanation
The stopping potential is given by eV₀ = hc/λ − ϕ. Substituting the values, we get V₀ = 1.2 V. The negative sign indicates the direction of the potential.
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